CN209356648U - Battery full charge testing circuit, electronic device - Google Patents
Battery full charge testing circuit, electronic device Download PDFInfo
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- CN209356648U CN209356648U CN201821868876.8U CN201821868876U CN209356648U CN 209356648 U CN209356648 U CN 209356648U CN 201821868876 U CN201821868876 U CN 201821868876U CN 209356648 U CN209356648 U CN 209356648U
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- battery
- decision circuitry
- charging
- comparator
- preset duration
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Abstract
The utility model provides a kind of battery full charge testing circuit, electronic device, and first resistor is connected between battery and the charging circuit to charge to battery；Operational amplifier amplifies the voltage at first resistor both ends, and by amplified voltage output to comparator；Second input terminal of comparator is connected with reference voltage end, and comparator exports control instruction to decision circuitry for amplified voltage to be compared with reference voltage, and when voltage after amplification is less than reference voltage；Decision circuitry judges whether the duration of control instruction is equal to preset duration, if being equal to or more than preset duration, then determine that control instruction is effective, battery fills with electricity, if it is less than preset duration, then determine that the control instruction is invalid, the battery is not fully charged, whether fills with electricity so as to accurate judgement battery.
Description
Technical field
The utility model relates to battery boosting technology fields, more specifically to a kind of battery full charge testing circuit, electricity
Sub-device.
Background technique
Lithium ion battery due to having many advantages, such as high voltage, high-energy density, high security, low self-discharge rate, by
It is widely used in the fields such as electric car, energy-accumulating power station, smart phone and laptop.
The charging process of lithium ion battery can be divided into four-stage: trickle charge stage (pre-charging stage), constant current are filled
Electric stage, constant voltage charging phase and charging termination stage.
As shown in Figure 1, in the trickle charge stage, be first pre-charged the battery to discharge completely using trickle charge and (restored
Property charging).Use trickle charge when cell voltage is lower than 3V or so, trickle-charge current be constant-current charge electric current ten/
One.By taking constant charge current is equal to 1A as an example, trickle-charge current 100mA.
Constant-current charging phase improves charging current and carries out constant current when cell voltage rises to trickle charge threshold value or more
Charging.The electric current of constant-current charge is in 0.2C between 1.0C.Cell voltage is stepped up with constant-current charge process, general single-unit
The voltage that battery is set is 3.0V~4.2V.
Constant voltage charging phase, when cell voltage rises to 4.2V, constant-current charge terminates, and starts constant voltage charging phase.Electricity
Stream is according to the degree of saturation of battery battery core, and with the continuation of charging process, charging current is slowly reduced by maximum value, when being reduced to
When 0.01C, it is believed that charging termination.Wherein, C is with a kind of representation method of battery nominal capacity control electric current, as battery is
The capacity of 1000mAh, 1C are exactly charging current 1000mA.
In the charging termination stage, there are two types of typical charging termination judgment methods: minimum charge current determining method and timer
Determining method.Minimum charge current determining method monitors the charging current of constant voltage charging phase, and is reduced to 0.02C extremely in charging current
Charging is terminated when 0.07C.Timing when timer determining method is since constant voltage charging phase is terminated after two hours of persistently charging and is filled
Electric process.
But both methods is all unable to whether accurate judgement battery is full of, and is easy to overshoot battery, to battery
Aging effects are very big.
Utility model content
In view of this, the present invention provides a kind of battery full charge testing circuits, electronic device, to solve the prior art
In the problem of whether accurate judgement battery is full of be unable to.
To achieve the above object, the utility model provides the following technical solutions:
A kind of battery full charge testing circuit, including first resistor, operational amplifier, comparator, second resistance and judgement electricity
Road；
The first resistor is connected between battery and the charging circuit to charge to the battery；
The first input end of the operational amplifier is connected with the first end of the first resistor, the operational amplifier
Second input terminal is connected with the second end of the first resistor, and the operational amplifier is used for the electricity to the first resistor both ends
Pressure amplifies, and by amplified voltage output to the comparator；
The first end of the second resistance is connected with the output end of the operational amplifier, the second end of the second resistance
Ground connection；
The first input end of the comparator is connected with the output end of the operational amplifier, and the second of the comparator is defeated
Entering end to be connected with reference voltage end, the comparator is used to for the amplified voltage being compared with reference voltage, and
When the amplified voltage is less than the reference voltage, output control instruction to the decision circuitry；
The input terminal of the decision circuitry is connected with the output end of the comparator, and the decision circuitry is described for judging
Whether the duration of control instruction is equal to preset duration, if being equal to or more than preset duration, determines that the control instruction is effective,
The battery fills with electricity, if it is less than the preset duration, then determines that the control instruction is invalid, the battery does not fill
Full electricity.
Optionally, the decision circuitry is also used to when determining that the battery fills with electricity, Xiang Suoshu charging circuit hair
Open command is sent, stops charging to the battery to control the charging circuit.
Optionally, the decision circuitry includes length counter, the input terminal of the length counter and the comparator
Output end be connected, the output end of the length counter is connected with the charging circuit, the length counter be used for judge
Whether the duration of the control instruction is equal to preset duration, if being equal to or more than preset duration, sends out to the charging circuit
Send open command.
Optionally, the decision circuitry is also used to adjust the value of the preset duration according to the adjustment instruction received.
A kind of electronic device, including battery and charging chip, the charging chip include charging circuit and battery full of inspection
Slowdown monitoring circuit；
The charging circuit is used to charge to the battery；
The battery full charge testing circuit is described in any item battery full charge testing circuits as above.
It optionally, further include master controller；
The master controller is connected with the decision circuitry of the battery full charge testing circuit, for according to the electronic device
Power consumption condition to the decision circuitry input adjustment instruction, to adjust the value of the preset duration.
Compared with prior art, technical solution provided by the utility model has the advantage that
Battery full charge testing circuit provided by the utility model, electronic device, due to first resistor be connected on battery with
And between charging circuit, therefore, the electric current in first resistor is equal to the charging current of battery.By judging first resistor both ends
Whether voltage is less than reference voltage, that is, can determine whether the charging current of battery is less than cutoff threshold, so as in the first electricity
When hindering the voltage at both ends less than reference voltage, the whether fully charged judgement of battery is carried out；
When the voltage at first resistor both ends is less than reference voltage, by judging whether the control instruction generated is effectively to control
System instruction, can accurate judgement battery whether fill with electricity, avoiding noise etc. causes to judge the fully charged problem of battery by accident.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the charging process schematic diagram of lithium ion electronics；
Fig. 2 is a kind of structural schematic diagram of battery full charge testing circuit provided by the embodiment of the utility model；
Fig. 3 is a kind of structural schematic diagram of electronic device provided by the embodiment of the utility model.
Specific embodiment
It is the core concept of the utility model above, to enable the above objects, features, and advantages of the utility model more
Add and become apparent, the following will be combined with the drawings in the embodiments of the present invention, to the technical scheme in the embodiment of the utility model
It is clearly and completely described, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than complete
The embodiment in portion.Based on the embodiments of the present invention, those of ordinary skill in the art are not before making creative work
Every other embodiment obtained is put, is fallen within the protection scope of the utility model.
The utility model embodiment provides a kind of battery full charge testing circuit, applied to the electronic device with battery,
The electronic device can be smart phone, laptop, electric car and energy-accumulating power station etc..
As shown in Fig. 2, battery full charge testing circuit provided by the embodiment of the utility model, including first resistor 3, operation are put
Big device 4, comparator 5, decision circuitry 6 and second resistance 7.
Wherein, first resistor 3 is connected between battery 1 and the charging circuit 2 to charge to battery 1.It should be noted that
Battery 1 in the utility model embodiment can be lithium ion battery, be also possible to other rechargeable batteries, the utility model is not
It is only limitted to this.Charging circuit 2 is used to receive supply current from charger, and is charged using supply current to battery 1.
The first input end of operational amplifier 4 is connected with the first end of first resistor 3, the second input of operational amplifier 4
End is connected with the second end of first resistor 3, and operational amplifier 4 will be put for amplifying to the voltage at 3 both ends of first resistor
Voltage output after big is to comparator 5.
The first end of second resistance 7 is connected with the output end of operational amplifier 4, the second end ground connection of second resistance 7,
In, second resistance 7 is load resistance.
The first input end of comparator 5 is connected with the output end of operational amplifier 4, the second input terminal and ginseng of comparator 5
It examines voltage end Vref to be connected, comparator 5 is for amplified voltage to be compared with reference voltage, and voltage after amplification
When less than reference voltage, output control instruction to decision circuitry 6.
The input terminal of decision circuitry 6 is connected with the output end of comparator 5, decision circuitry 6 be used for judge control instruction when
It is long whether to be equal to preset duration, if being equal to or more than preset duration, determine that control instruction is effective, battery 1 fills with electricity,
If it is less than preset duration, then control instruction is invalid, and battery 1 is not fully charged.
On the basis of the above embodiments, the decision circuitry 6 in the utility model embodiment is also used to determining battery 1
Through it is fully charged when, to charging circuit 2 send open command, with control charging circuit 2 stop to battery 1 charge.It needs to illustrate
It is that charging circuit 2 includes switch, whether which charges to battery 1, that is to say, that when closing the switch
When, charging circuit 2 charges to battery 1, and when the switches are opened, charging circuit 2 no longer charges to battery 1.
In one embodiment of the utility model, decision circuitry 6 include length counter, the input terminal of length counter with
The output end of comparator 5 is connected, and the output end of length counter is connected with charging circuit 2, and length counter is for judging control
Whether the duration of instruction is equal to preset duration, if being equal to or more than preset duration, sends open command to charging circuit.When
So, the utility model is not limited to that, in other embodiments, decision circuitry 6 can also be realized by other logical devices
Above-mentioned function.
On the basis of the above embodiments, the decision circuitry 6 in the utility model embodiment is also used to what basis received
Adjustment instruction adjusts the value of preset duration, more accurately to carry out the fully charged judgement of battery 1.
For example, ining use, while charging when mobile phone frequently can lead to charging current and is unable to reach cutoff threshold cause
Charging can not stop, and can dynamically adjust the value of preset duration in the utility model according to the power consumption condition of current phone, keep away
Exempt from charging to be discontented with or overshoot.
In the utility model embodiment, the charging process of battery 1 includes trickle charge stage, constant-current charging phase, constant pressure
Charging stage and this four-stage of charging termination stage, also, in constant voltage charging phase, when charging current slowly reduces, and
When less than cutoff threshold, that is, trickle-charge current threshold value, since first resistor 3 is connected between battery 1 and charging circuit 2, the
Electric current in one resistance 3 is equal to the charging current of battery 1, and therefore, the voltage at amplified 3 both ends of first resistor can be less than reference
Voltage at this point, comparator 5 can be flipped, and exports control instruction.
In practical charging process, charging current be not it is dull gradually reduce, since charging current is there are noise,
Therefore, charging current can rise and fall near cutoff threshold, cause the voltage at amplified 3 both ends of first resistor attached in reference voltage
It is close to rise and fall, cause comparator 5 to overturn back and forth, repeatedly exports control instruction.But it is only preset when the duration of control instruction is greater than
When duration, control instruction is only effective instruction, and the charging current that could characterize battery 1 is less than cutoff threshold, could characterize electricity
Pond 1 fills with electricity.
Pass through in the utility model embodiment and sentence to exclude to be unsatisfactory for the noise jamming of preset duration requirement based on this
Deenergizing judges whether the duration of control instruction is equal to preset duration, to judge whether control instruction is effective control instruction, with
Whether accurate judgement battery 1 fills with electricity.
The utility model embodiment additionally provides a kind of electronic device, which can be smart phone, notebook
Computer, electric car and energy-accumulating power station etc., as shown in figure 3, the electronic device includes battery 1 and charging chip, the charging
Chip includes charging circuit 2 and the battery full charge testing circuit that any embodiment as above provides.Wherein, charging circuit 2 is to electricity
The circuit that pond 1 is charged.
Electronic device in the utility model embodiment includes master controller 8, which is the CPU of electronic device
(Central Processing Unit/Processor, central processing unit).The master controller 8 and battery full charge testing circuit
Decision circuitry 6 be connected, it is default to adjust for inputting adjustment instruction to decision circuitry 6 according to the power consumption condition of electronic device
The value of duration.
That is, master controller 8 generates adjustment instruction according to the power consumption condition of electronic device, and adjustment instruction is sent
To decision circuitry 6, after decision circuitry 6 receives adjustment instruction, the value of preset duration is adjusted.
Specifically, the value of preset duration can be reduced when the power consumption of electronic device is big, in the power consumption of electronic device
Hour, increase the value of preset duration.
Battery full charge testing circuit provided by the utility model, electronic device, due to first resistor be connected on battery with
And between charging circuit, therefore, the electric current in first resistor is equal to the charging current of battery.By judging first resistor both ends
Whether voltage is less than reference voltage, that is, can determine whether the charging current of battery is less than cutoff threshold, so as in the first electricity
The voltage for hindering both ends is less than reference voltage, when, carry out the whether fully charged judgement of battery；
When the voltage at first resistor both ends is less than reference voltage, by judging whether the control instruction generated is effectively to control
System instruction, can accurate judgement battery whether fill with electricity, avoiding noise etc. causes to judge the fully charged problem of battery by accident.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (4)
1. a kind of battery full charge testing circuit, which is characterized in that including first resistor, operational amplifier, comparator, second resistance
And decision circuitry；
The first resistor is connected between battery and the charging circuit to charge to the battery；
The first input end of the operational amplifier is connected with the first end of the first resistor, and the second of the operational amplifier
Input terminal is connected with the second end of the first resistor, the operational amplifier be used for the voltage at the first resistor both ends into
Row amplification, and by amplified voltage output to the comparator；
The first end of the second resistance is connected with the output end of the operational amplifier, the second termination of the second resistance
Ground；
The first input end of the comparator is connected with the output end of the operational amplifier, the second input terminal of the comparator
It is connected with reference voltage end, the comparator is used to for the amplified voltage being compared with reference voltage, and described
When amplified voltage is less than the reference voltage, output control instruction to the decision circuitry；
The input terminal of the decision circuitry is connected with the output end of the comparator, and the decision circuitry is for judging the control
Whether the duration of instruction is equal to preset duration, if being equal to or more than preset duration, determines that the control instruction is effective, described
Battery fills with electricity, if it is less than the preset duration, then determines that the control instruction is invalid, the battery and underfill
Electricity；
The decision circuitry is also used to when determining that the battery fills with electricity, and Xiang Suoshu charging circuit sends open command,
Stop charging to the battery to control the charging circuit；
The decision circuitry includes length counter, the output end phase of the input terminal of the length counter and the comparator
Even, the output end of the length counter is connected with the charging circuit, and the length counter is for judging that the control refers to
Whether the duration of order is equal to preset duration, if being equal to or more than preset duration, sends open command to the charging circuit.
2. detection circuit according to claim 1, which is characterized in that the decision circuitry is also used to according to the tune received
Whole instruction adjusts the value of the preset duration.
3. a kind of electronic device, which is characterized in that including battery and charging chip, the charging chip includes charging circuit and electricity
Pond is full of detection circuit；
The charging circuit is used to charge to the battery；
The battery full charge testing circuit is the described in any item battery full charge testing circuits of claim 1~2.
4. electronic device according to claim 3, which is characterized in that further include master controller；
The master controller is connected with the decision circuitry of the battery full charge testing circuit, for the consumption according to the electronic device
Electric situation inputs adjustment instruction to the decision circuitry, to adjust the value of the preset duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821868876.8U CN209356648U (en) | 2018-11-13 | 2018-11-13 | Battery full charge testing circuit, electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821868876.8U CN209356648U (en) | 2018-11-13 | 2018-11-13 | Battery full charge testing circuit, electronic device |
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| CN209356648U true CN209356648U (en) | 2019-09-06 |
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| CN201821868876.8U Active CN209356648U (en) | 2018-11-13 | 2018-11-13 | Battery full charge testing circuit, electronic device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212422A (en) * | 2018-11-13 | 2019-01-15 | 上海艾为电子技术股份有限公司 | Battery full charge testing circuit and its detection battery be full of method, electronic device |
| CN110896240A (en) * | 2019-11-30 | 2020-03-20 | Tcl移动通信科技（宁波）有限公司 | Charging control method and device, computer readable storage medium and terminal |
| CN111934399A (en) * | 2020-09-22 | 2020-11-13 | 深圳英集芯科技有限公司 | Charging chip and electronic equipment |
-
2018
- 2018-11-13 CN CN201821868876.8U patent/CN209356648U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212422A (en) * | 2018-11-13 | 2019-01-15 | 上海艾为电子技术股份有限公司 | Battery full charge testing circuit and its detection battery be full of method, electronic device |
| CN109212422B (en) * | 2018-11-13 | 2024-05-07 | 上海艾为电子技术股份有限公司 | Battery full detection circuit, method for detecting battery full and electronic device |
| CN110896240A (en) * | 2019-11-30 | 2020-03-20 | Tcl移动通信科技（宁波）有限公司 | Charging control method and device, computer readable storage medium and terminal |
| CN110896240B (en) * | 2019-11-30 | 2022-08-05 | Tcl移动通信科技（宁波）有限公司 | Charging control method and device, computer readable storage medium and terminal |
| CN111934399A (en) * | 2020-09-22 | 2020-11-13 | 深圳英集芯科技有限公司 | Charging chip and electronic equipment |
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